| O36.1990 | Maternal care for other isoimmunization, unspecified trimester, not applicable or unspecified | BILLABLE CODE |
| O36.1991 | Maternal care for other isoimmunization, unspecified trimester, fetus 1 | BILLABLE CODE |
| O36.1992 | Maternal care for other isoimmunization, unspecified trimester, fetus 2 | BILLABLE CODE |
| O36.1993 | Maternal care for other isoimmunization, unspecified trimester, fetus 3 | BILLABLE CODE |
| O36.1994 | Maternal care for other isoimmunization, unspecified trimester, fetus 4 | BILLABLE CODE |
| O36.1995 | Maternal care for other isoimmunization, unspecified trimester, fetus 5 | BILLABLE CODE |
| O36.1999 | Maternal care for other isoimmunization, unspecified trimester, other fetus | BILLABLE CODE |
